Seal for pumps



MamhZZ, 1932'. R. H. FREDERICK 1,350,749

SEAL FOR PUMPS OriginalFiled March 31, 1928 Hill lllllllll lHlll RWHFWM Patented Mar. 22,: 1932 i UNITED! STATES; PATENT" ounce BEEUEL H. FREDERICK, OF IRVINGTON, NEWJ'ERSEY, ASSIGNORiTO AMES lUMP. COM- PANY,- INC., 013 NEW YORK, IN. Y., A. CORPORATION OF NEW YORK! SEAL m. ruins Original application filed March 31,1928, Serial No. 266,149. Divided and this application filed October 7,

a 1930. Serial No. 486,892. v

The subject of the present ap lication, which is a division of my co-pen ing, case Serial No. 266,149, filed March 31, 1928, (Patent No. 1,805,765, datedMay' 19, 1931) concerns improvements in labyrinth seals for rotary elements, more particularly the rotor or impeller hub of acentrifugal pump.

As heretofore constructed sealing means of this type embodied intermeshing grooved 1 rings whereof the opposingwalls aiforded a direct sinuousjoint which when the device was used in connection with a centrifugal pump, caused an increase in the velocity of the leakage from the impeller chamber to the suction ,chamber, thus impairing the inlet capacity and the suction lift of the pump. Moreover the maximum area of the rotating packing ring member was subjected to the higher pressure in the impeller chamber, thus no causing undue friction of the contiguous rings.

' he-object of the invention is to provide.

simple and efficient sealing means, including a rotating packing ring of novel cross-sectionand complementary case rings therefor,

whereby a relativelysmall: area of the packing ringis subjected to the higher pressure and whereby the velocity of the leakage is decreased in its flow, thus obviating the ohso jections above mentioned.

To'this end the invention comprises features of novelty which will be hereinafter described and claimed.

In the drawings-- 85:' Figure 1 is a transverse vertical section through a portion of the impeller andsuction chambers of a centrifugal pump provided with annular sealingdevices embodying my invention. 4 Fig. 2 is a similar section enlarged through a portion of one of the sealing devices and associated parts.

Fig. 3 represents theseparated ring elements of one of the sealing devices.

' 1 Referring to the drawings, 12 designates a pump casinghaving a suction chamber 13 and an impeller chamber 14 16 designates the rotor or impeller whereof the hub 17 is mounted on;a power-driven shaft 20 having its bearings in the side walls of the casing.

The hub is provided with inlet eyes 101 afford,

ing passages between the suction and 'im-- peller chambers. Packing rings cross-section are screwed or otherwise fastened on the respective endsof the hub g '17, and complementary case-rings 28 and 29 are fitted on the respective sides of each of the rings 27 so as to mesh with and form inner and outer peripheral bearing surfaces or portions between the rings 27, and their complerunning' of the interposed rings 27.

The case ring 28 at the suction chamber side is of general E-form in cross-section with an outer peripheral flange 30, which ring is' fitted to the outer side of the ring 27: so as to register with and embrace the latter, the upper member, including its flange, being tlghtly seated in the case ring bore of the casing wall, and the wall of this bore being.

formed with an annular recess 31to receive the flange. The case ring 29 at the impeller chamber side is of general U-form in crosssection with an outer peripheral flange 32, which ring is fitted to the inner side of the adjacent ring 27, with the upper member chamber and the suction chamber, which joint presents spaced lateral zig-zag passages connected at their outer ends b an extended cross-passage b (Fig. 2) throug all of which the leakage from the impellerehamber is constrained to flow in'an extended devious and reverse course before it issues therefrom (at 0) into the suction chamber at the mouth of the adjacent inlet eye of the hub, and hence the amount of leakageis reduced to a minimum and at the'same time the velocity of the escaping liquid is ma- 27 of general H-form in mentary rings 28 and 29, yet permit the free terially reduced, as previously mentioned.

Inv addition the minimum surface (at d) of the rotatingpacking ring is subjected to the 1 pressure in the impeller chamber, thus minimizing the friction between the associated sealing members.

I claim 1. Sealing means of the character described, comprising a rotatable ring of general H-form in cross-section having two outer and one inner peripheral bearing surface on each side, and a stationary ring on each side of the H-rin and being 1n bearing relation 10 with said suriace to afford a joint having two spaced lateral zig-zag passages connected at one end by an extended cross-passage, one of said rings being of genera E-form in cross-section and the other being of general 1 U-form in cross-section.

2. Sealing means for a pump having imller and suction chambers, and an impeller ub having an inlet eye for delivering fluid from the suction chamber to the impeller a chamber, said sealing means comprisln a. ring of general H-form in crosssection ast on the hub having two outer and two inner peripheral bearing portions on the suction chamber side and two outer and one inner g peripheral bearing portions on the impeller chamber side, and a stationary ring on each side of the H-ring and being in bearing relation with said bearing portions, the rin at the suction chamber side being of genera .10 E-form in cross-section and the ring at the impeller chamber side being of general U- form in cross-section.

Signed at New York, in the county and State of New York, this 3rd day of October, u A. D. 1930.

RHEUEL H. FREDERICK. 

